John gilson



(No Model.)

J. GILSON.

REVOLVING AND TILTING CHAIR.

Patented June 17, 1890.

niiiii UNITED STAT S" PATENT OFFICE.

JOHN GILSON, OF PORT VASHINGTON, WVISOONSIN.

REVOLVING AND TlLTlNG CHAIR.

SPECIFICATION forming part-of Letters Patent No. 430,314, dated June 17,1890.

' Application filed November 27, 1889. Serial No. 331,775. (No model.)

To all whom it may concern:

Be it known that I, JOHN GILSON, of Port Washington, in the county ofOzaukee and State of Wisconsin, have invented new and usefulImprovements in Revolving and Tilting Chairs; and I do hereby declarethe following to be a full, clear, and exact description of saidinvention, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

Figure 1 is an elevation of my improved device, shown in connection withso much of the seat and legs of a chair as is necessary to show itsrelation thereto. Fig. 2 shows a small part of the top of the spindleand supporting device in connection with the thereon-supported tiltingdevice, some parts being in vertical section. Fig. 3 is a view of thesame parts shown in Fig. 2, taken at right angles thereto, some partsbeing in vertical section.

Fig. 4 is an under side view of the legs and head on which my device issupported. Fig. 5 is a vertical central section of the device forraising and lowering the chair-seat, and on which it revolves, partsbeing in a modified form. Fig. 6 is a modified form of the tiltingdevice.

An iron head-block A is provided with sockets in its lateral edges, inwhich are inserted the legs B B, whereon my device and the chair aboveit are supported. The head-blockA is of considerable vertical height,and is provided with a vertical central aperture, through which passesmovably the spindle C, which has a bearing of considerable length, andthough movable therein is fitted thereto with sufficient closeness to beretained and held against tilting and is guided in its rotary andendwise movements thereby. An arm D, preferably in the form of a yoke,as shown in Fig. 1, has its extremities in ways, preferably dovetailedgrooves E E, therefor in the lateral edges of the head-block A, and isadapted to move and to be adjusted endwise therein. A pin F passesmovably through the arm D, and is adapted to enter in one of a series ofvertical sockets G G therefor in the headblook A at the bottom of one ofthe grooves E.

For conveniently withdrawing the pin F from a socket G, it is attachedto a lever H,

pivoted on the arm D, and provided with a spring H, adapted to hold thepin up to its work. The arInD supports the chair thereon and is adaptedto be raised or lowered in the head-block A, whereby the height of thechair can be adjusted, and the arm is secured in position on thehead-block by the pin F, which passes through the arm and, enters asocket G, thereby locking the arm in position with relation to thehead-block.

In the modified form shown in Fig. 5 the supporting-arm U has but oneleg, the other being omitted, and instead of a pin F a setscrew'F isused to lock the arm in position to the head-block. A chair-iron I, ofirregular cup shape, is secured rigidly to the top of the spindle O, thespindle being inserted in an aperture therefor in the bottom of the cupand riveted therein for that purpose. This cup I rests and is revolubleon the arm D, through which the spindle 0 passes in an aperture thereforand in which it is rotatable. A spider K, on which the chair-seat L isfixed, rests and tilts on the chair-iron I. For the purpose of formingthis tilting connection between the chair-iron I and spider K, the sidewalls of the chair-iron are provided centrally with upwardly-extendingprojections M, which form a fulcrum on which corresponding parts of thespider K rest, and whereon the spider and chair-seat are tilted.

The chair-iron I is provided with notches N N immediately in front ofthe projections M M, into which extend projections N N, integral withthe spider, whereby the spider is held in position against front or rearmovement on the chair-iron. Bearing-surfaces O O are also provided onthe top near the front and rear of the chair-iron I, and correspondingbearing-surfaces O O are formed on the spider K, which are adapted toengage the bearing-surfaces O 0, whereby the tilting movement of thechair is limited and controlled. Two lugsP P, integralwith the spider,extend downwardly therefrom into the chairiron I, near its side walls,and a rod R, passing through the lower ends of the lugs P P, projectsbeyond those lugs into apertures S S therefor in the side walls oftheiron I. These apertures are so formed and located with reference tothe lugs P P and rod R that as the spider and chair-seat tilt to theextent provided for by the connection between the spider and thechair-iron the ends of the rod R move in an are close to the upper wallsof the apertures S, and when the chair-seat is in its level position, asshown in Fig. 1, the rod R bears against shoulders projecting downwardlyfrom the upper walls of the apertures, adapted to receive the rodthereagainst, and when the chair is tilted backwardly to the extentpermitted by the con struction of the spider and chair-iron the rod Rengages shoulders projecting downwardly from the top' walls of theapertures S S, near their front ends, whereby the further rearwardtipping of the chair-seat is prevented. This rod R, passing through thelugs P P and extending through the apertures S S slightly beyond thewalls of the chair-iron I, serves not only to limitthe tilting movementof the spider and chair-seat, but also holds the chair-seat in positionon the chair-iron I.

To hold the chair-seat yieldingly against tilting backward, a wirespring '1 is located just at the rear of the lower ends of the lugs P P,and its inner end rests against the iron I, while its outer end bearsagainst a screwthreaded head U, turning on a stem V, the inner end ofwhich stem V is secured to a yoke W centrally, the yoke being providedwithsmall apertures near its two ends, through which the rod R passesmovably. The yoke WV is of such length as to fit nicely between the lugsP P, so that the yoke cannot move endwise between the lugs, and the stemV is thereby held constantly in a central position between the lugs, andthe force of the resistance of the spring T on the stem Vis exertedtruly and centrally between the lugs P P at right angles to the rod R.

In Fig. 6 a modified form of chair-iron and spider is shown, in whichthe upwardly-extending projections M M extend forwardly horizontally attheir extreme ends into lateral recesses therefor in the correspondingprojections on the spider.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. In a revolving chair, a head-block supported fixedly on the legs ofthe chair, in combination with a chair-iron on which the spider afiixedto a chair-seat is fulcrumed, which chair-iron is provided with a rigidcylindrical spindle that passes through the headblock and has rotary andvertical movement therein with such considerable length of bearing inthe head-block as to hold the chairiron against tilting, and an armfitted to and adjustable vertically in ways in the headblock, which armextends upwardly and is turned over above the head-block and carries thechair-iron by a bearing on the top surface, the spindle of thechair-iron passing through the arm and having normally rotary movementonly therein, a series of sockets G G in the head-block A, arrangedvertically in the bottom of a groove E, and a pin, as F, passing movablythrough the vertically-moving arm, whereby the chair-seat may be adjusted and supported vertically, substantially as described.

2. The combination, with the chair-iron I, provided with slots S S and athereon-supported and tilting spider K, provided with lugs P P extendingdownwardly at a distance apart into the iron I, of a yoke W, locatedbetween thelugs P P and secured therein by a rod R passing through thelugs and through the ends of the yoke, on which rod the yoke ispermitted to oscillate, a stem V, fixed at one end in the yokecentrally, and a compression-spring T, coiled around the stem V andbearing against the chair-iron at one end and against a head on the stemV at the other end, the ends of the rod B being free to move in theslots S S, substantially as described.

3. In a revolving chair, the combination, with a chair-iron I andupwardly and horizontally projecting parts M M thereof, of a spider K,fulcrumed on the projections'M M and having lateral recesses withinwhich the horizontally-extending projections M M enter, substantially asdescribed.

4. In a revolving chair, the combination, with a chair-iron I, of aspider K, fulcrumed on the top surface of the chair-iron, lugs P P,integral with and extending'downwardly from the spider, and rod B,passing through the lugs and extending into apertures S S therefor inthe walls of the chair-iron, whereby the connection between thechair-iron and spider is made secure and the tilting movement of thespider is limited, substantially as described.

5. In a revolving and tilting chair, a chairiron I, having a head formedwith opposite side walls, the tops of which walls have each a centrallyupwardly-extending projection, a recess in the rear of the projection,and bearings, as O O, in front and at the rear of the projection, andthe recess, in combination with a spider supporting the chair-seat,which spider is fulcrumed on the chair-iron head and is formed with apart having side walls registering with the side walls of the chairironhead, which walls have each a downwardly-extending projection adapted toenter the recess in the side wall of the chair-iron head, and bearin gsO 0', corresponding to the bearings O O, substantially as described.

In testimony whereof I aifix my signature in presence of two witnesses.

JOHN GILSON.

WVitnesses:

W. .I. DIEDERICH, H. L. Con.

